Rubber composition and method of preserving rubber



{ions so prei terioration which it nnrmaliv parts of rueb Patented July 25, 15%33 PAUL c. JONES, F CUYAHQI Perry; or NEW "rein ere'res ieie'zzs ATENT @FFEQE "'A FALLS, 015.10, ASSIGNOR TO THE B l. GOODEECH GOM- SRK, N. Y., A CORPORATION OF NEXV YORK RUBBER GOIvIPQSITION AND METHOD OF PRESERVING RUBBER N0 Drawing.

This invention relates to he art of preserving rubber, either in the vulcanized 0r nu.- vulcanized en dition, and en-rubber (OIHPOSI- it is Well hnewn that man} substance-e, known generically anti-exidunilq or ageresister. oss ens the propert when innerporat-ed into rubber, of retarding}; the deundergoes when exposed in light, heui' or r. ieet of this: inven ion 'i "in prnv rie a new uni, iisefui ciassief" uge-resisf 21ml $0 provide age-resisting i. .bber CQIHZWfmiEiODS.

This invention, in brief, consists in rreaiing' rubber with an.Ermine-iscoeromatic hvdro- Carbon, such as; p-nminigumbenzene or emine-manenhflm'sue. Such emnpounds huvebeenfmind in po se to marked (e ree the property of retarding the dererieraion of rubber cnn'ig ositieue into which tziey They employed 1 r'zion of from .2 to the uge-rersister to 3.00

h ave been inr vrg'mrutee. preferubi in the pm; 5.0 parts by weigh; of

As specific exempss of the method of big invention rubber cmupeei inns were prepared Containing blended piziuuriun rubbers in-O parts by weight, sulfur 53.5 parks, zinc oxide "141;: 30 parts, black 4i0 pzuts. mineral rub ber parts, palm oii 5 and hexamethylene tern mine 0.75 pare. One such composition w'heui; zige-resister was need. an a. control. Two others contained ugeueon in ihe other ingredients, 0.95 part (0.5/0 0'? the compositien) respectively of emiinruzo-beiizene and amino-anuprithaiene. The compositions; were heroughly mixed. and cured ii: a press for minutes; at 294-".

.. before and hirer aging.

The vuicanized compositions were ieeimi in compare their relative rates of by measuring their tensile strength and emngziiiun at the breaking point iirc'ei uied aging '45 was carried uni"- in The Gear aging oven, in

which the samples were maintained at a temperature 01 158 F. in a constantly renewed strewn of air, as well as in the Bierer-Davis bomb in which they were maintained at the 56' same temperature in an atmosphere of oxy- Applica'tion filed August 22, 1928. Serial No. 301,429.

gen at a pressure of 300 lbs. per sq. in. The reeults are shown in the following table:

Tensile strength in lbs. per sq. in. and elongation at the breaking point After 48 hours in the Bierer- Davis bomb After 7 days in Before ag the Gear oven Age-resister 0.5%

Tensile Elun- Tensile Elon- Tensile Elonstrength getion strength gation strength gation None (control) 3539 657% 2072 503% 688 317% A1nin0az0benzene H 3638 653% 2363 643% 1067 418% Aininu-azo-nnphthelene H 3792 707% 2445 567% 1548 510% From the above results it is evident that :r-L unnrm-uzo aromatic hydrocarbons are very "iiCCblVG 1n rearding the deterioration or" rubber. iilxeil unnno-azo-compounds,

such as that of benzene and naphthalene, and subsututed ciimpouuds, such as the dimeth- Fit i111!IH)--ZLZ()-OQHZGH6 have aiso been tested zinc; founai to be effective age-resistors. in crui, substuutmri prniinets, especiaily runver by miiiing er einiiiur iirncees. or to the apniiezfiion thereof in the .Qur'fuce at a miss rc-r vuiitunized rubber. The tin-iii rubber is iikewise enipinye i in the rhiiim in a. generic sense in ineiude (3011b im'zfl. buhitu, gnite r-e. in. I'Hbij l' isomers amlike prmiueis. WL L or not admixed iiiiers, pigments. 'uh-unizingz; or accelerating agents.

I claim:

1. The met-had of preserving rubber which comprises treating rubber with amino-{1Z0- aromatic hydrocarbons containing at least one condensed ring nucleus."

2. The method n'eserving rubber which comprises treating rubber w' aromatic hydrocarbons con. one naphthalene nucleus.

3. The method of preserving rubber which comprises trca ting rubber with p-ainino-azo naphthalene.

4. A composition of matter comprising rubber and aini11o-azo-aroniatic hydrocarbons containing at least one condensed ring nucleus.

5. A composition of matter comprising rubber and p-amino-azo-aromatic hydrocarbons containing at least one naphthalene nucleus.

6. A composition of matter comprising rubber and p-amino azo napthalene.

7. A rubber product resulting from the vulcanization of a rubber composition comprising a vulcanizing agent, an accelerator of vulcanization, and a tramino-aZoaromatic hydrocarbon containing at least one condensed ring nucleus.

8. A rubber product resulting from the vulcanization of a rubber composition comprising a vulcanizing agent, an accelerator of vulcanization, and p-amino-szouaphthalene.

9. The method of preserving rubber which comprises treating rubber with a substance of the following formula where R is an aryl group and R is an amino substituted aryl group containing at least 7 carbon atoms.

10. The method of preserving rubber which comprises treating rubber with a substance of the following formula where R is an aryl group and R is an amino substituted aryl group containing at least 7 carbon atoms.

13. A rubber composition comprising rubber and a substance of the following formula where R and R are aromatic hydrocarbon groups, one of which contains a benzene ring and the other a naphthalene ring.

14. A rubber composition comprising rubber and dimethylamino az'o benzene.

PAUL C. JONES. 

